Chemical Kinetics: Enzymes Essay -- Chemical Kinetics: Enzymes

Chemical Kinetics is the branch of chemistry that studies the speed at which a chemical reaction occur and the factor that influence this speed. What is meant by the speed of a reaction is the rate at which the concentrations of reactants and products change within a time period. Some reactions occur almost instantaneously, while others take days or years. Chemical kinetics understanding I used in the process of designing drugs, controlling pollution and the processing of food. Most of the time chemical kinetics is used to speed or to increase the rate of a reaction rather than to maximize the amount of product. The rate of a reaction is often expressed in terms of change in concentration (Δ [ ]) per unit of time (Δ t). We can measure the rate of a reaction by monitoring either the decrease in concentration (molarity) of the reactant or the increase in the product concentration. Considering the following hypothetical reaction: A 2B Where A molecules are being converted to B molecules, we can say that the rate of this reaction would be: _ Δ [A] (with respect to the decrease in A concentration) Δ t 1 Δ [B] (with respect to the increase in B concentration) 2 Δ t Many factors influence rates of chemical reactions. Some of these factors include: the nature of reactants, for example the formation of salts, acid-base reactions, and exchange of ions are fast reactions, while in reactions where bigger molecules are formed or break apart are typically slow; temperature, frequently, the higher the temperature, the faster the reaction; concentration effect, the reliance of reaction rates on concentrations are called rate laws. Rate laws are expressions of rates in terms of the concentra... ...t being the only target of these enzymes they also make changes retinol, steroids, and fatty acids. The collection of different kinds of alcohol dehydrogenase guarantees that there will always be one that is just perfect for the each task. This enzyme size is 80,000 g/mol, its charge is pI = 5.4, and it optimal pH I 8.6. Works Cited 1. ADH. http://bio.chem.niu.edu/Chem570/Templates/ADH/ 2. Alcohol Dehydrogenase. http://florey.biosci.uq.oz.au/Html/Images/Galleria/dulley/text.html 3. Alcohol Dehydrogenase. http://www.lmcp.jussieu.fr/iucr-top/comm/cteach/pamphlets/15/node30.html 4. Worthington Price List. Alcohol Dehydrogenase http://www.worthington-biochem.com/priceList/A/AlcoholD.html http://www.mssc.edu/biology/B305/GTS/ss98/cjd/alcoholdh.htm http://www.uni-saarland.de/~mkiefer/coenz.htm http://www.chm.davidson.edu/vce/kinetics/ReactionRates.html

Digital Fortress Chapter 123-126

Chapter 123 An ashen technician ran to the podium. â€Å"Tunnel block's about to go!† Jabba turned to the VR onscreen. The attackers surged forward, only a whisker away from their assault on the fifth and final wall. The databank was running out of time. Susan blocked out the chaos around her. She read Tankado's bizarre message over and over. PRIME DIFFERENCE BETWEEN ELEMENTS RESPONSIBLE FOR HIROSHIMA AND NAGASAKI â€Å"It's not even a question!† Brinkerhoff cried. â€Å"How can it have an answer?† â€Å"We need a number,† Jabba reminded. â€Å"The kill-code is numeric.† â€Å"Silence,† Fontaine said evenly. He turned and addressed Susan. â€Å"Ms. Fletcher, you've gotten us this far. I need your best guess.† Susan took a deep breath. â€Å"The kill-code entry field accepts numerics only. My guess is that this is some sort of clue as to the correct number. The text mentions Hiroshima and Nagasaki-the two cities that were hit by atomic bombs. Maybe the kill-code is related to the number of casualties, the estimated dollars of damage†¦Ã¢â‚¬  She paused a moment, rereading the clue. â€Å"The word ‘difference' seems important. The prime difference between Nagasaki and Hiroshima. Apparently Tankado felt the two incidents differed somehow.† Fontaine's expression did not change. Nonetheless, hope was fading fast. It seemed the political backdrops surrounding the two most devastating blasts in history needed to be analyzed, compared, and translated into some magic number†¦ and all within the next five minutes. Chapter 124 â€Å"Final shield under attack!† On the VR, the PEM authorization programming was now being consumed. Black, penetrating lines engulfed the final protective shield and began forcing their way toward its core. Prowling hackers were now appearing from all over the world. The number was doubling almost every minute. Before long, anyone with a computer-foreign spies, radicals, terrorists-would have access to all of the U.S. government's classified information. As technicians tried vainly to sever power, the assembly on the podium studied the message. Even David and the two NSA agents were trying to crack the code from their van in Spain. PRIME DIFFERENCE BETWEEN ELEMENTS RESPONSIBLE FORHIROSHIMA AND NAGASAKI Soshi thought aloud. â€Å"The elements responsible for Hiroshima and Nagasaki†¦ Pearl Harbor? Hirohito's refusal to†¦Ã¢â‚¬  â€Å"We need a number,† Jabba repeated, â€Å"not political theories. We're talking mathematics-not history!† Soshi fell silent. â€Å"How about payloads?† Brinkerhoff offered. â€Å"Casualties? Dollars damage?† â€Å"We're looking for an exact figure,† Susan reminded. â€Å"Damage estimates vary.† She stared up at the message. â€Å"The elements responsible†¦Ã¢â‚¬  Three thousand miles away, David Becker's eyes flew open. â€Å"Elements!† he declared. â€Å"We're talking math, not history!† All heads turned toward the satellite screen. â€Å"Tankado's playing word games!† Becker spouted. â€Å"The word ‘elements' has multiple meanings!† â€Å"Spit it out, Mr. Becker,† Fontaine snapped. â€Å"He's talking about chemical elements-not sociopolitical ones!† Becker's announcement met blank looks. â€Å"Elements!† he prompted. â€Å"The periodic table! Chemical elements! Didn't any of you see the movie Fat Man and Little Boy-about the Manhattan Project? The two atomic bombs were different. They used different fuel-different elements!† Soshi clapped her hands. â€Å"Yes! He's right! I read that! The two bombs used different fuels! One used uranium and one used plutonium! Two different elements!† A hush swept across the room. â€Å"Uranium and plutonium!† Jabba exclaimed, suddenly hopeful. â€Å"The clue asks for the difference between the two elements!† He spun to his army of workers. â€Å"The difference between uranium and plutonium! Who knows what it is?† Blank stares all around. â€Å"Come on!† Jabba said. â€Å"Didn't you kids go to college? Somebody! Anybody! I need the difference between plutonium and uranium!† No response. Susan turned to Soshi. â€Å"I need access to the Web. Is there a browser here?† Soshi nodded. â€Å"Netscape's sweetest.† Susan grabbed her hand. â€Å"Come on. We're going surfing.† Chapter 125 â€Å"How much time?† Jabba demanded from the podium. There was no response from the technicians in the back. They stood riveted, staring up at the VR. The final shield was getting dangerously thin. Nearby, Susan and Soshi pored over the results of their Web search. â€Å"Outlaw Labs?† Susan asked. â€Å"Who are they?† Soshi shrugged. â€Å"You want me to open it?† â€Å"Damn right,† she said. â€Å"Six hundred forty-seven text references to uranium, plutonium, and atomic bombs. Sounds like our best bet.† Soshi opened the link. A disclaimer appeared. The information contained in this file is strictly for academic use only. Any layperson attempting to construct any of the devices described runs the risk of radiation poisoning and/or self-explosion. â€Å"Self-explosion?† Soshi said. â€Å"Jesus.† â€Å"Search it,† Fontaine snapped over his shoulder. â€Å"Let's see what we've got.† Soshi plowed into the document. She scrolled past a recipe for urea nitrate, an explosive ten times more powerful than dynamite. The information rolled by like a recipe for butterscotch brownies. â€Å"Plutonium and uranium,† Jabba repeated. â€Å"Let's focus.† â€Å"Go back,† Susan ordered. â€Å"The document's too big. Find the table of contents.† Soshi scrolled backward until she found it. I. Mechanism of an Atomic Bomb A) Altimeter B) Air Pressure Detonator C) Detonating Heads D) Explosive Charges E) Neutron Deflector F) Uranium Plutonium G) Lead Shield H) Fuses II. Nuclear Fission/Nuclear Fusion A) Fission (A-Bomb) Fusion (H-Bomb) B) U-235, U-238, and Plutonium III. History of the Atomic Weapons A) Development (The Manhattan Project) B) Detonation 1) Hiroshima 2) Nagasaki 3) By-products of Atomic Detonations 4) Blast Zones â€Å"Section two!† Susan cried. â€Å"Uranium and plutonium! Go!† Everyone waited while Soshi found the right section. â€Å"This is it,† she said. â€Å"Hold on.† She quickly scanned the data. â€Å"There's a lot of information here. A whole chart. How do we know which difference we're looking for? One occurs naturally, one is man-made. Plutonium was first discovered by-â€Å" â€Å"A number,† Jabba reminded. â€Å"We need a number.† Susan reread Tankado's message. The prime difference between the elements†¦ the difference between†¦ we need a number†¦ â€Å"Wait!† she said. â€Å"The word ‘difference' has multiple meanings. We need a number-so we're talking math. It's another of Tankado's word games-‘difference' means subtraction.† â€Å"Yes!† Becker agreed from the screen overhead. â€Å"Maybe the elements have different numbers of protons or something? If you subtract-† â€Å"He's right!† Jabba said, turning to Soshi. â€Å"Are there any numbers on that chart? Proton counts? Half-lives? Anything we can subtract?† â€Å"Three minutes!† a technician called. â€Å"How about supercritical mass?† Soshi ventured. â€Å"It says the supercritical mass for plutonium is 35.2 pounds.† â€Å"Yes!† Jabba said. â€Å"Check uranium! What's the supercritical mass of uranium?† Soshi searched. â€Å"Um†¦ 110 pounds.† â€Å"One hundred ten?† Jabba looked suddenly hopeful. â€Å"What's 35.2 from 110?† â€Å"Seventy-four point eight,† Susan snapped. â€Å"But I don't think-â€Å" â€Å"Out of my way,† Jabba commanded, plowing toward the keyboard. â€Å"That's got to be the kill-code! The difference between their critical masses! Seventy-four point eight!† â€Å"Hold on,† Susan said, peering over Soshi's shoulder. â€Å"There's more here. Atomic weights. Neutron counts. Extraction techniques.† She skimmed the chart. â€Å"Uranium splits into barium and krypton; plutonium does something else. Uranium has 92 protons and 146 neutrons, but-â€Å" â€Å"We need the most obvious difference,† Midge chimed in. â€Å"The clue reads ‘the primary difference between the elements.' â€Å" â€Å"Jesus Christ!† Jabba swore. â€Å"How do we know what Tankado considered the primary difference?† David interrupted. â€Å"Actually, the clue reads prime, not primary.† The word hit Susan right between the eyes. â€Å"Prime!† she exclaimed. â€Å"Prime!† She spun to Jabba. â€Å"The kill-code is a prime number! Think about it! It makes perfect sense!† Jabba instantly knew Susan was right. Ensei Tankado had built his career on prime numbers. Primes were the fundamental building blocks of all encryption algorithms-unique values that had no factors other than one and themselves. Primes worked well in code writing because they were impossible for computers to guess using typical number-tree factoring. Soshi jumped in. â€Å"Yes! It's perfect! Primes are essential to Japanese culture! Haiku uses primes. Three lines and syllable counts of five, seven, five. All primes. The temples of Kyoto all have-â€Å" â€Å"Enough!† Jabba said. â€Å"Even if the kill-code is a prime, so what! There are endless possibilities!† Susan knew Jabba was right. Because the number line was infinite, one could always look a little farther and find another prime number. Between zero and a million, there were over 70,000 choices. It all depended on how large a prime Tankado decided to use. The bigger it was, the harder it was to guess. â€Å"It'll be huge.† Jabba groaned. â€Å"Whatever prime Tankado chose is sure to be a monster.† A call went up from the rear of the room. â€Å"Two-minute warning!† Jabba gazed up at the VR in defeat. The final shield was starting to crumble. Technicians were rushing everywhere. Something in Susan told her they were close. â€Å"We can do this!† she declared, taking control. â€Å"Of all the differences between uranium and plutonium, I bet only one can be represented as a prime number! That's our final clue. The number we're looking for is prime!† Jabba eyed the uranium/plutonium chart on the monitor and threw up his arms. â€Å"There must be a hundred entries here! There's no way we can subtract them all and check for primes.† â€Å"A lot of the entries are nonnumeric,† Susan encouraged. â€Å"We can ignore them. Uranium's natural, plutonium's man-made. Uranium uses a gun barrel detonator, plutonium uses implosion. They're not numbers, so they're irrelevant!† â€Å"Do it,† Fontaine ordered. On the VR, the final wall was eggshell thin. Jabba mopped his brow. â€Å"All right, here goes nothing. Start subtracting. I'll take the top quarter. Susan, you've got the middle. Everybody else split up the rest. We're looking for a prime difference.† Within seconds, it was clear they'd never make it. The numbers were enormous, and in many cases the units didn't match up. â€Å"It's apples and goddamn oranges,† Jabba said. â€Å"We've got gamma rays against electromagnetic pulse. Fissionable against unfissionable. Some is pure. Some is percentage. It's a mess!† â€Å"It's got to be here,† Susan said firmly. â€Å"We've got to think. There's some difference between plutonium and uranium that we're missing! Something simple!† â€Å"Ah†¦ guys?† Soshi said. She'd created a second document window and was perusing the rest of the Outlaw Labs document. â€Å"What is it?† Fontaine demanded. â€Å"Find something?† â€Å"Um, sort of.† She sounded uneasy. â€Å"You know how I told you the Nagasaki bomb was a plutonium bomb?† â€Å"Yeah,† they all replied in unison. â€Å"Well†¦Ã¢â‚¬  Soshi took a deep breath. â€Å"Looks like I made a mistake.† â€Å"What!† Jabba choked. â€Å"We've been looking for the wrong thing?† Soshi pointed to the screen. They huddled around and read the text: †¦the common misconception that the Nagasaki bomb was a plutonium bomb. In fact, the device employed uranium, like its sister bomb in Hiroshima. â€Å"But-† Susan gasped. â€Å"If both elements were uranium, how are we supposed to find the difference between the two?† â€Å"Maybe Tankado made a mistake,† Fontaine ventured. â€Å"Maybe he didn't know the bombs were the same.† â€Å"No.† Susan sighed. â€Å"He was a cripple because of those bombs. He'd know the facts cold.† Chapter 126 â€Å"One minute!† Jabba eyed the VR. â€Å"PEM authorization's going fast. Last line of defense. And there's a crowd at the door.† â€Å"Focus!† Fontaine commanded. Soshi sat in front of the Web browser and read aloud. †¦Nagasaki bomb did not use plutonium but rather an artificially manufactured, neutron-saturated isotope of uranium 238.† â€Å"Damn!† Brinkerhoff swore. â€Å"Both bombs used uranium. The elements responsible for Hiroshima and Nagasaki were both uranium. There is no difference!† â€Å"We're dead,† Midge moaned. â€Å"Wait,† Susan said. â€Å"Read that last part again!† Soshi repeated the text. â€Å"†¦artificially manufactured, neutron-saturated isotope of uranium 238.† â€Å"238?† Susan exclaimed. â€Å"Didn't we just see something that said Hiroshima's bomb used some other isotope of uranium?† They all exchanged puzzled glances. Soshi frantically scrolled backward and found the spot. â€Å"Yes! It says here that the Hiroshima bomb used a different isotope of uranium!† Midge gasped in amazement. â€Å"They're both uranium-but they're different kinds!† â€Å"Both uranium?† Jabba muscled in and stared at the terminal. â€Å"Apples and apples! Perfect!† â€Å"How are the two isotopes different?† Fontaine demanded. â€Å"It's got to be something basic.† Soshi scrolled through the document. â€Å"Hold on†¦ looking†¦ okay†¦Ã¢â‚¬  â€Å"Forty-five seconds!† a voice called out. Susan looked up. The final shield was almost invisible now. â€Å"Here it is!† Soshi exclaimed. â€Å"Read it!† Jabba was sweating. â€Å"What's the difference! There must be some difference between the two!† â€Å"Yes!† Soshi pointed to her monitor. â€Å"Look!† They all read the text: †¦two bombs employed two different fuels†¦ precisely identical chemical characteristics. No ordinary chemical extraction can separate the two isotopes. They are, with the exception of minute differences in weight, perfectly identical. â€Å"Atomic weight!† Jabba said, excitedly. â€Å"That's it! The only difference is their weights! That's the key! Give me their weights! We'll subtract them!† â€Å"Hold on,† Soshi said, scrolling ahead. â€Å"Almost there! Yes!† Everyone scanned the text. †¦difference in weight very slight†¦ †¦gaseous diffusion to separate them†¦ †¦10,032498X10?134 as compared to 19,39484X10?23.** â€Å"There they are!† Jabba screamed. â€Å"That's it! Those are the weights!† â€Å"Thirty seconds!† â€Å"Go,† Fontaine whispered. â€Å"Subtract them. Quickly.† Jabba palmed his calculator and started entering numbers. â€Å"What's the asterisk?† Susan demanded. â€Å"There's an asterisk after the figures!† Jabba ignored her. He was already working his calculator keys furiously. â€Å"Careful!† Soshi urged. â€Å"We need an exact figure.† â€Å"The asterisk,† Susan repeated. â€Å"There's a footnote.† Soshi clicked to the bottom of the paragraph. Susan read the asterisked footnote. She went white. â€Å"Oh†¦ dear God.† Jabba looked up. â€Å"What?† They all leaned in, and there was a communal sigh of defeat. The tiny footnote read: **12% margin of error. Published figures vary from lab to lab.

Urban Planning in Developing Countries

Urban Planning in Developing States Introduction In recent old ages, there has been an increasing involvement in 3rd universe urban planning. Over past three decennaries at that place has been a big migration of China`s population from rural to urban parts. As Grubler says: â€Å"Fast urbanisation and consequent land usage alteration had altered ecosystems, destroyed wildlife home grounds, changed regional climes and released big sums of C into the atmosphere† ( Grubler, 1998 ) . At the same clip, the metropoliss are developing really fast but ignored the quality of planning. As a effect, the citizens` life quality has dropped quickly. There is grounds, nevertheless, that citizens who live in a well-planned metropolis happen it easy to hold a high felicity degree. For illustration, Barcelona`s metropolis program remains one of the best theoretical accounts in the universe even Spain may be confronting important economic and political challenges these old ages. Compared with other metropoliss in the development states, Barcelona has paid more attending on the metropolis users` perceptual experience and experience, the metropolis contrivers ever put the users` feeling foremost and so comes the regulations, that is why Barcelona`s citizens can easy bask their life at that place. On the other manus, citizens of the developing countries` metropoliss will be harder to advance happiness index. A inquiry originating from these considerations concerns the best manner to plan metropoliss or re-plan metropoliss of developing states. The undertaking will analyze the urban design in developing states. It will look at how to do the most suited determination for every 3rd universe states ‘ planning. It will explicate why we should pay more attending to this country. First, the undertaking will do a comparing between the urban design in developed states and that in developing states. Second, the undertaking will speak about how to do a good program in developing states. Third, the undertaking will analysis the feasibleness of doing a good program in developing states. Section 1 Urban planning in the universeUrban planning in developed statesPlaning used to be a physical infinite theory, but for now, the developed countries` planning is a theory of public policy and public direction. As the basic urban building is completed, what they should make now is merely to maintain upgrading each country of a metropolis and increase public engagement. As Potter says: â€Å"By now, many states in both the developed and developing universe parts espouse the demand for greater public engagement in planning, although in pattern, many may merely pay it lip service.† ( Potter, 2012, p.149 ) In developed states, the contrivers play an of import function in the society. The contrivers ever spend batch of clip to understand the metropoliss and forecast the development of the metropoliss. City is like a system and the system is a complicated entireness, which contains a batch of objects and subdivisions. The contrivers in developed states will make their best to unite them and do them related to each other. On the other manus, the contrivers are ever glad to listen to the citizens and roll up their sentiments ; they will unite assortment of particular demands and programs to go a comprehensive rational pick. For these grounds, the citizens in developed states are much easier to obtain felicity.Urban planning in developing statesThe planning procedure in alleged developing states, like China, is radically different from western states. In recent old ages, big Numberss of instructors came back from abroad conveying back the thoughts of aliens, so base on balls on to their pup ils. However, the urbanisation procedure in China is rather different with foreign states and we do non hold a ain theory which is suited for this state of affairs, the manner we are be aftering is copying western theoretical accounts, that is why we have so much jobs in today`s metropoliss. Developing states ever have economically backward, the easiest manner to turn economic system is to increase the population. With the growing of population, many jobs will be much harder to work out than earlier, such as the relationships between persons, lodging, transit and environment. The contrivers in most of the developing states ever put net incomes in the first topographic point and disregard the metropolis user`s experience, they will believe small about the city`s hereafter. Developing states besides used to pursuit the develop velocity and disregard the quality of a metropolis. Any city`s development is a long historical procedure, there must hold a big figure of civilization relics in this procedure. But as this phase of urban planning in China, most of the historical and cultural sights were badly damaged by our alleged development. When speaking about the environment in China, it is besides a immense job. A good environment is a critical status of metropolis developing. With the unsuitable method of program a metropolis, the air quality, H2O quality and other environmental quality decreased aggressively in these few decennaries. Compared with the urban planning in developed states, there is a deficiency of future chances in developing states ‘ urban planning. Section 2 How to do a suited program in developing states 2.1 What should authorities and contrivers do? The authorities should pay more attending on metropolis planning than earlier. They used to pay excessively much attending on the economic system increasing and about ignored the metropolis planning, so they should alter their head to maintain the balance between them. The authorities should beef up the earnestness of urban be aftering which including strengthen jurisprudence enforcement, promote the enforcement procedure, better enforcement steps and other related steps. During the planning procedure, the contrivers should set citizens to the first topographic point but non net incomes. Environmental quality is really of import in presents, the contrivers should non disregard it because urban planning is a theory of functioning the persons, and they should develop the metropolis without harm the environment of citizens. Urban be aftering should reflect the net incomes of the populace such as the country of transit, amusement, medical attention, instruction and so on, contrivers must do certain people-oriented. As Silva says: â€Å"Urban contrivers face major challenges in the aggregation of informations towards analyzing the invariably altering societal, economic and environmental conditions in cities.† ( Silva, 2010, p.388 ) 2.2 What should citizens make? Urban planning is non an matter of authorities and contrivers, the populace should besides take participate in it. The citizens of a metropolis should better their quality and have an international position to convey aid to urban development. In developed states, the correct theory said that urban planning is a collaborative procedure. When necessary, public should give nonsubjective advices and helpful suggestions to assist the contrivers, guarantee the procedure is come oning. On the other manus, everyone should make their best to protect the environment and cut down the waste of resources in the procedure of urban development, in order to cut down the force per unit area of authorities and contrivers. The connexion between cities` users and contrivers should be a co-operation relationship. Section 3 The feasibleness of urban planning in developing states. 3.1 A instance analysis of Shanghai This paragraph presents a instance analysis of Shanghai, China ‘s largest and most of import industrial centre. Rapid industrial and economic development in China over the past three decennaries has resulted in a big migration from rural countries to metropoliss, the population of Shanghai was more than twofold and building country increased quickly every bit same as the figure of vehicles. For this ground, it is a truly tough work to re-plan a metropolis like Shanghai. Since we can non cut down the figure of population, the lone manner to re-plan the metropolis is to accommodate the current state of affairs and happen out the suited solutions. During the past decennaries, Shanghai had spent a immense figure of money on the urban substructure investing ( see Appendix 1 ) . Even the authorities used this portion of fillip to upgrade a batch of countries of substructure investing, but it is still difficult to equilibrate the relationships between persons, lodging, transit and env ironment. 3.2 Problems and troubles The migration and urbanisation is still keep increasing in the metropoliss like Shanghai and we can non calculate the hereafter. If we can construct little and moderate-sized metropoliss, which have perfect map, surround the large metropoliss, they may pull people to travel in from the large metropoliss. This method will alter the migration and urbanization tendency, it besides can better the growing and development of both large metropoliss and other metropoliss. As Pacione says: National industrial-development policy, including the determination to construct little and moderate-sized metropoliss for investing allotment intents, has straight affected the growing and development of Shanghai†¦ They conclude that the Chinese achievement in large-scale urban transmutation and their success in incorporating the spacial growing of big industrial centres is a singular accomplishment in urban and regional planning, which should be studied closely by contrivers in both the developed and the underdeveloped states. ( Pacione, 1981, p.26 ) On the other manus, this method may be useless to China because of the population. There has more chances in large metropoliss such as Shanghai, it is truly a tough work to alter people`s head to migrate to smaller metropoliss. With a immense figure of population and deficiency of public engagement in big metropoliss, the work of program and re-plan tend to be harder. Compared with developed states, there will be much less jobs in urban design or metropolis re-planning. Decision Taking the suggested solutions could work out the jobs in developing states but it will take a long clip for developing states to maintain gait with the developed states. The developing states should larn the manner of developed states, but still necessitate to happen out a much more suited manner to be after the metropoliss or re-plan them. A good metropolis planning contains a batch of elements and it is non merely a procedure to incorporate assorted of resources, it should convey urban occupants a more comfy and harmonious life environment. Although many of the developing countries` metropoliss are upgrading, but in most of their program there still exist unscientific, irrational and follow blindly. The cities` contrivers made their determination to do the metropoliss become a new Manhattan or a new Hong Kong irrespective of the specific fortunes, the figure of these metropoliss now is at least 40 harmonizing to relevant statistics. We can non merely concentrate on economic development and bury the significance of urban be aftering itself. Developing states has a batch of jobs in the urban planning procedure, it is due to miss of research establishments for urban planning. At this point, the developed states ever have their ain urban be aftering research establishments, which will happen the most suited solutions to upgrade the metropoliss. The developing states should construct research centres like the developed states and understand the metropoliss so that the contrivers can do the right determinations. Mentions Grubler, A. ( 1998 )Technology and Global Change. Cambridge: Cambridge University Press. Potter, R. ( 2012 )Urbanization and Planning in the Third World.Routledge Ltd. Silva, C. ( 2010 )Handbook of Research on E-planning. Information Science Reference ( Isr ) Pacione, M. ( ed. ) ( 1981 )Problems and be aftering in Third World metropoliss. Great Britain: Biddles Ltd. Shanghai Bureau of Statistic ( 2011 ) . Available at: hypertext transfer protocol: //www.stats-sh.gov.cn/tjnj/nje11.htm? d1=2011tjnje/E1001.htmYearEntirePower CoevalsTransportation systemPost and TelecommunicationsPublic UtilitiesCivil Constructions2000449.964.6148.8368.69104.4163.342001510.7872.2260.72107.792.25177.892002583.4962.1463.01108.23148.42201.692003604.6266273.7776.5836.91151.362004672.5889.52316.9654.3926.92184.82005885.74124.22385.5858.3241.33276.2820061125.54116.23589.52113.7256.23249.8420071466.33163.3840.46101.5760.9300.1120081733.18129.53838.91108.59112.81543.3420092113.45253.39978.24122.66135.95623.2120101497.46148.5754.66111.5486.58396.18100 million kwai Appendix 1: Urban Infrastructure Investment of Shanghai ( 2000-2010 )

Packet Sniffing

Sniffing In short, packet sniffing is the method used to see all kinds of information as is passes over the network it is linked to, but how does a packet sniffer work? A packet sniffer is a piece of software or hardware capable of monitoring all network traffic. It is able to capture all incoming and outgoing traffic for example clear-text passwords, user names and other private or sensitive details. Packet sniffing is a form of wire-tap applied to computer networks instead of phone networks. It came into vogue with Ethernet, which is known as a â€Å"shared medium† network.This means that traffic on a segment passes by all hosts attached to that segment. Ethernet hardware contained a filter that prevented the host machine from actually seeing any other traffic than that belonging to the host. Sniffing programs turn off the filter, and thus see everyones traffic. In the scheme of things, a computer usually only examines a packet of data that corresponds to the computerâ€℠¢s address but with a packet sniffer you are able to set the network interface to ‘promiscuous mode’. In this case it examines ALL available information passing through it.As the data passes through the system it is copied and stored in memory or on a hard drive. The copies are then able to be studied and the information analyzed. The captured information is decoded from raw digital form into a  human-readable  format that permits users of the protocol analyzer to easily review the exchanged information As soon as you connect to the internet, you ‘sign on’ to a network that is under the watch of your ISP. This network can communicate with other networks and in short forms the basis of the internet.If a packet sniffer is located at a server owned by your ISP, it has the potential to gain access to: * The web sites visited. * What is searched for on the site. * Your e-mail recipients. * The contents of your mail. * Any files you download. * A list of your audio, video and telephony options. * A list of visitors to your website. Switched vs. Non-Switched In a non-switched network environment packet sniffing is an easy thing to do. This is because network traffic is sent to a hub which broadcasts it to everyone. Switched networks are completely different in the way they operate.Switches work by sending traffic to the destination host only. This happens because switches have CAM tables. These tables store information like MAC addresses, switch ports, and VLAN information [1]. Before sending traffic from one host to another on the same local area network, the host ARP cache is first checked. The ARP cache is a table that stores both Layer 2 (MAC) addresses and Layer 3 (IP) addresses of hosts on the local network. If the destination host isn’t in the ARP cache, the source host sends a broadcast ARP request looking for the host. When the host replies,the traffic can be sent to it.The traffic goes from the source host to the switch, and then directly to the destination host. This description shows that traffic isn’t broadcast out to every host, but only to the destination host, therefore it’s harder to sniff traffic. Passive Vs. Active Sniffing Sniffers are a powerful piece of software. They have the capability to place the hosting system’s network card into promiscuous mode. A network card in promiscuous mode can receive all the data it can see, not just packets addressed to it. Passive Sniffing If you are on a hub, a lot of traffic can potentially be affected.Hubs see all the traffic in that particular collision domain. Sniffing performed on a hub is known as passive sniffing. Passive sniffing is performed when the user is on a hub. Because the user is on a hub, all traffic is sent to all ports. All the attacker must do is to start the sniffer and just wait for someone on the same collision domain to start sending or receiving data. Collision domain is a logical area of the network in wh ich one or more data packets can collide with each other. Passive sniffing worked well during the days that hubs were used.The problem is that there are few of these devices left. Most modern networks use switches. That is where active sniffing comes in. Active Sniffing When sniffing is performed on a switched network, it is known as active sniffing. Active sniffing relies on injecting packets into the network that causes traffic. Active sniffing is required to bypass the segmentation that switches provided. Switches maintain their own ARP cache in a special type of memory known as Content Addressable Memory (CAM), keeping track of which host is connected to which port.Sniffers operate at the Data Link layer of the OSI model. This means that they do not have to play by the same rules as applications and services that reside further up the stack. Sniffers can grab whatever they see on the wire and record it for later review. They allow the user to see all the data contained in the pa cket, even information that should remain hidden. The terms active and passive sniffing has also been used to describe  wireless network sniffing. They have analogous meaning. Passive wireless sniffing involves sending no packets, and monitoring the packets send by the others.Active sniffing involves sending out multiple network probes to identify APs. How Does a Packet Sniffer Work? A packet sniffer works by viewing every packet sent in the network. This includes packets not intended for itself. How does it do this? Three types of sniffing methods are used. Methods may work in non-switched networks or in switched networks. These methods are: IP-based sniffing I. P -based sniffing works by putting the network card into promiscuous mode and sniffing all packets matching the IP address filter and is the original type of packet sniffing.The IP address filtering isn’t switched on so the sniffing program is able to capture all the packets. This method will only function in non-s witched networks. MAC-based sniffing MAC-based sniffing works by putting the network card into promiscuous mode and sniffing all packets that match the MAC address filter. ARP-based sniffing ————————————————- ARP-based sniffing doesn’t put the network card into promiscuous mode because ARP packets are sent to its administrators. This is because the ARP protocol is stateless.This means that sniffing can be done on a switched network. Once a hacker has found possible networks to attack, one of their first tasks is to identify the target. Many organizations are nice enough to include their names or addresses in the network name. The Sniffer program works by asking a computer, specifically its Network Interface Card (NIC), to stop ignoring all the traffic headed to other computers and pay attention to them. It does this by placing the NIC in a state known as promiscuous mode.Once a NIC is promiscuous mode, a machine can see all the data transmitted on its segment. The program then begins to constantly read all information entering the PC through the network card. Data traveling along the network comes as frames, or packets, bursts of bits formatted to specific protocols. Because of this strict formatting, the sniffer peels away the layers of encapsulation and decodes the relevant information stored in the packet sent, including the identity of the source computer, that of the targeted computer, and every piece of information exchanged between the two computer.Even if the network administrator has configured his equipment in such a way as to hide information, there are tools available that can determine this information. Utilizing any well known network sniffing tools, an attacker can easily monitor the unencrypted networks. Modes: On wired broadcast and wireless LANs, to capture traffic other than  unicast  traffic sent to the machine running the sniffer software,  multicast  traffic sent to a multicast group to which that machine is listening, and  broadcast  traffic, the  network adapter  being used to apture the traffic must be put into  promiscuous mode; some sniffers support this, others don't. On wireless LANs, even if the adapter is in promiscuous mode, packets not for the  service set  for which the adapter is configured will usually be ignored. To see those packets, the adapter must be in  monitor mode. Who Uses a Packet Sniffer? Packet sniffers are often used by ISP’s as a diagnostic tool for their back-up systems, so it is in fact a well-utilized form of technology. Packet sniffing is also sometimes used to investigate the habits and actions of criminals, for example in the FBI’s Carnivore System.As I am sure you will appreciate from the above, packet sniffers can be a useful, relatively harmless tool or a potentially dangerous invasion of privacy. Packet sniffers are a perfec t example of how technology may be used to help or to harm. USES: The versatility of packet sniffers means they can be used to: * Analyze network problems * Detect  network intrusion  attempts * Detect network misuse by internal and external users * Documenting regulatory compliance through logging all perimeter and endpoint traffic * Gain information for effecting a network intrusion * Isolate exploited systems * Monitor WAN bandwidth utilization Monitor network usage (including internal and external users and systems) * Monitor data-in-motion * Monitor WAN and endpoint security status * Gather and report network statistics * Filter suspect content from network traffic * Serve as primary data source for day-to-day network monitoring and management * Spy on other network users and collect sensitive information such as passwords (depending on any content  encryption  methods which may be in use) * Reverse engineer  proprietary protocols  used over the network * Debug clie nt/server communications * Debug network protocol implementations Verify adds, moves and changes * Verify internal control system effectiveness (firewalls, access control, Web filter, Spam filter, proxy) DEFENSE Detection Protection Conclusion Having looked at what they are, why they work and how they are used, it is easy to view sniffers as both dangerous threats and powerful tools. Every user should understand they are vulnerable to these types of attacks and their best defense lies in encryption. Administrators and professionals need to know that these programs are superb diagnostic utilities that can, unfortunately, be used with malicious intent on any network.

Balancing Power

In today’s economic condition, work life equilibrium is considered one of the most imperative workplace issues. Work life balance refers to a satisfactory niche between many different roles in an individual’s life. But how to manage this balance to avoid conflict; this topic is discussed through many different aspects enlightened through personal experience. Work Life Balance Before taking any step towards knowing how to achieve work life balance, first we must gain an understanding about what work life balance actually refers to.It is about maintaining equilibrium between work and personal life, facing the multifarious demands in one’s life. The best equilibrium is different for each person because we all have different priorities in life. A young entrepreneur faces different challenges than a family man at the apex of his career. Work life balance involves two factors; Achievement and Enjoyment. Our life will be valuable and balanced when, in all the aspects of life, we are daily achieving success with all the joys of living! My Side of StoryBeing a young student struggling to manage good grades, working part time to support my education during this era of recession as well trying to give my family sufficient of my time as required, at many times I felt the misbalance in my life that is called work-life conflict. I felt unable to manage my time and was highly dissatisfied with my work and progress. Failing health and self esteem and disrupted routine was then a common state of affairs. I was new, hence obsessed with working hard to carve a niche for my career.In order to secure my grades I became overcommitted to my studies as well. I ended up drained every day, spending most of the time on the run†¦ from study to work, work to home and spending rest of the time sitting on computer. All I had once read and heard about work life complications was coming true in my life without my realizing it. It was not until when my parents had to h ave a ‘serious talk’ with me, that I realized where this chaos was leading me to. That instantly snapped me back; I set off to work on improving my standards. The informationIn order to balance one’s work life situation, you may need to look into four quadrants of your life- Friends, Family, Work and Self. Any disturbance in one of them because of the interference of another quadrant may cause work life conflict. Work life conflict must be removed in order to solve the problem and acquire balance. This information regarding the causes can be obtained by observation of daily life experiences and authentic researches conducted. According to the Business Week reports, Individuals who consider their work life balance better than others are likely to work 21% better than those who don’t.Moreover, a study shows people encounter work life conflict have 40% more chances of mood and anxiety disorders, (Kane, 2006); While employees having lower level of this conflic t experience increased job satisfaction. The Evaluation After gathering basic information, now I knew what I was missing and what I got to do. I loved my job, but without my natural energy boosters, I was unhappy and even feeling a bit guilty. My whole time revolved around my work and career, but I couldn’t make up for the very essential part of my life, that is my friends and family.From my newly gained knowledge, I deduced that a balanced approach at my level will be spending quality time with my friends and family that will have a positive physical and psychological impact on me. Moreover, I’ll be free of piled up responsibilities, procrastinated duties, and burden on my mental self, which will eventually also improve my progress in other quadrants of my life. I had to use it to devise such solutions that cancel out where I overdo, and give more space to those I neglected so a balance can be created. The SolutionAs I was already a student I opted for the greatest fa cility available today for work life balance concerned employees- Flexible timings, so that I can have more sense of control over my work. Dinner and meals would at no cost be skipped- they provide a quality time for whole family to be together. Also, sleeping schedules must be maintained, so there remain no health problems. Being present is the key word. No drifting away and being in two places at a time. On weekend there would be no computer, no emails, and no emergency calls from work!I could spend quality time with my family. I could contact my friends, go out and have some fun. Lastly, to spend some of my time on myself; a time to relax or do what pleases me. It’s a kind of meditation, hence keeps your mind calm and alert. Giving my study ample time and not burdening myself with more work than I could manage, was also essential. Conclusion The set of habits I formed as a solution for my work life problem, not only supports but emphasizes a sound balance between work and life activities.Back then I couldn’t see past my work; it still plays a principle part in my life, though it’s not my one and only concern anymore. This equilibrium I discovered open my eyes to worth of other things, that made not only my work, but my life much more gratifying. References Kane, S. (2006). Work Life Balance Strategies. Retrieved July 20, 2009 from http://legalcareers. about. com/od/careertrends/a/worklifebalance. htm Work-Life Balance. (2003). Work-Life Balance Defined- What it really means! Retrieved July 20, 2009 from http://www. worklifebalance. com/worklifebalancedefined. html

Fashion Marketing -Marks and Spencer Essay Example | Topics and Well Written Essays - 1000 words

Fashion Marketing -Marks and Spencer - Essay Example The essay "Fashion Marketing - Marks and Spencer" concerns the fashion marketing. The company started by Amancio Ortega at the Northern part of Spain continually enjoyed growth in the Spanish market through strategic prepositions. Initially, the chain served the needs of the local consumer in the young feminine segment. Within the last ten years, the company grew proportionately to increased revenues and consumer loyalty through the modernized approaches that it employed. The company preserves the strengths of analyzing the customer targets in the market as serving the entire fashion market poses more threats than opportunities. The company defines that the youthful female consumer depicts a standardized behavior throughout the geographical segments. Zara depicts that the consumer buying decision model affects all businesses alike. The company analyzes fashion needs through the online research surveys and establishes on the fashion trends that depict a favorable rate of return on inv estment. Through a communicative channel that tends to link the company to the consumer, Zara advertises on the release of the garments that target to suit perceived consumer needs. The company runs a solely owned ultramodern factory that designs and makes garments in accordance to the anticipated consumer needs. Zara communicates actual date of releasing the new makes to the customer, and through an effective delivery chain, the company avails the garments to the more than 1500 outlets in 70 countries of the world economy. ... The Limited Collection brand was introduced in the late 2004; it was not being considered that it could significantly remain helpful to create such a unique differentiation. But it remained pretty successful and customers showed a very high adoptability towards the brand. However it has its same placement and the concept oriented approach which keenly values the notion of cost and brand consciousness. Serving segment is cost conscious group, target population is high class and upper middle class whereas positioning of the products is as a high quality and distinguished fashioned products. The Limited Collection brand offers a wide range of women’s, men’s and kid’s wear. The best feature of the brand is that the offerings are replaced each week from the outlet. In this way, it has a vast choice and unique variety because of rapid replacement of display items from the stores. The section of Limited Collection is not offered at every outlet which is a step towards a specification orientation (Marketingweek.co.uk, 2004). Competitors’ Analysis for Marks and Spencer Competitors’ analysis is really worth when designing a lucrative marketing strategy. The competitors of Marks and Spencer in fashion industry include a wide range of potential competitors. The competitors may include elite class fashion designers to middle class fashion wears. It is important to study the characteristics of the competitors. The realistic competitors of M&S are those who present their products to the population of upper middle class and higher classes of the society. Specifically the competitors of M&S may include Alde, Centra, Levi’s and ASDA. Although some of these companies

The process and the steps of pearl farming, including the benefits to Essay

The process and the steps of pearl farming, including the benefits to the environmental surrounding - Essay Example Eventually, the researcher will distinguish the differences between pearl oyster and a regular oyster. Prior to the conclusion, the researcher will discuss the positive impact of pearl farming on eco-tourism business in terms of the need to preserve the natural sea environment. Since the 17th century, the United States has been considered as a major source of fresh-water pearls. The â€Å"Tennessee River Freshwater Pearl Farm† which was founded by John Latendresse back in 1979 is the only freshwater pearl farm in the country. (American Pearl Company, 2008; U.S. Pearl Cultivation, 2008) In general, oyster pearls can either be produced in either fresh- or salt-water or both. Salt-water pearls are rounder, bigger, smoother and have a better luster. (Khulsey, 2008) Aside from the physical characteristics of these pearls, one of the most obvious differences between the two types of pearl is the fact that fresh-water pearls are cheaper as compared to salt-water pearls. Pearls that are bred for only a year is significantly cheaper than pearls bred for 30 years or more. (Journal Wuxi: Pearl of Taihu Lake, 2006) The scientific name of fresh water pearl oysters is known as the ‘Pinctada’ family which is totally different from edible oysters known as the ‘Ostreidae’. (Pacific Island, 2008) Silver- or gold-lip pearls mainly come from ‘Pinctada maxima’ whereas the black-lip pearls come from ‘Pinctada margaritifera.’ Saltwater white pearls in Japan’s white pearls come from ‘Pinctada fucata martensi’ which is also known as the ‘Akoya pearl oysters’. Lastly, the Keshii pearls in Japan can be formed either in fresh- or salt-water. (Khulsey, 2008) The sea water condition and age could greatly affect whether the oysters would have the male or a female sex organ. (Pacific Island, 2008) For this reason, maintaining the cleanliness of both fresh- and sea-waters is an essential part of pearl farming. When pearl